What type of distortion does Metallica use?

Answer 1

Metallica's James Hetfield: "Distortion always starts with the amp. Pedals just sit on top of the sound. They don't feel like a full part of it, just some fuzz on top. You can fiddle with parametric EQs and all that (bleep) for days, but it still won't have the smooth distortion of an amp. The last time I used a distortion [overdrive] pedal was on Ride the Lightning, and it was hell. It was an Ibanez Tube Screamer like Kirk uses. It really helps his solos cut through, but it puts a (bleep) coating on smooth rhythm tones, and it was hard to make it not sound like a pedal. You can recognize Marshall distortion in an instant; that's why I shied away from that and went with MESA/Boogies. I basically use the Boogie's distortion with a non-programmable studio-quality Aphex parametric EQ to fine-tune certain frequencies, dipping out some of the midrange. All my speakers are Celestion Vintage 30s."

Metallica's Kirk Hammett: "My philosophy has always been a clean amp with a stomp box. I hate the sound of piling distortion on top of distortion. [It sounds like he's criticizing using a mix of preamp and power amp distortion.] I was using a MESA/Boogie preamp, but I've gone back to the ADA MP-1 [the first preamp to combine MIDI and a preamp vacuum tube] with an ADA programmable EQ through a MESA/Boogie Strategy 400 power amp. For leads, I use a low gain setting on the ADA MP-1, but switch on an Ibanez Tube Screamer. Using the Tube Screamer in conjunction with a tube amp really brings out the tube qualities of the amp. And there's just something about that simple, raw, gritty fuzz box sound. One of the best lead sounds I ever got was when I played an Electro-Harmonix Big Muff through a Montgomery Ward amp with 3" speaker, for a Jeff Beck tone."